..Can Russia's S-400 shoot down F-35 stealth fighter or F-35 destroys S-400 missile system.
The S-400 Triumf (Russian: C-400 «Триумф», Triumph; NATO reporting name: SA-21 Growler), previously known as S-300PMU-3, is an anti-aircraft weapon system developed by Russia's Almaz Central Design Bureau in the 1990s as an upgrade of the S-300 family. It has been in service with the Russian Armed Forces since 2007.

The S-400 uses three different missiles to cover its entire performance envelope. These are the extremely long range 40N6, long range 48N6 and medium range 9M96 missile.
The Lockheed Martin F-35 Lightning II is a family of single-seat, single-engine, all-weather stealth multirole fighters undergoing final development and testing for the United States and partner nations. The fifth generation combat aircraft is designed to perform ground attack and air defense missions. The F-35 has three main models: the F-35A conventional takeoff and landing (CTOL) variant, the F-35B short take-off and vertical-landing (STOVL) variant, and the F-35C carrier-based Catapult Assisted Take-Off But Arrested Recovery (CATOBAR) variant. On 31 July 2015, the first squadron of F-35B fighters was declared ready for deployment after intensive testing by the United States Marines.[10][11] On 2 August 2016, the U.S. Air Force declared its first squadron of F-35A fighters as combat-ready.